Siren Marine Micro ePIR Motion Sensor - SM-ACC-EPIRMicro ePIR Motion Sensor The Micro ePIR motion sensor provides similar functionality as the Visonic 360 Ceiling Dualtech in the most compact and hard to detect package available. An ideal solution for monitoring a boats main entryway or corridor. Install on any wall or ceiling for a well concealed layer of security. The sensor will push an alert to the boat owner upon unauthorized entry and can be programmed to sound an audible alarm.